What is an 83(b) Election?

Section 83(b) of the Internal Revenue Code allows founders and startup employees to choose to be taxed on the fair market value (FMV) of restricted stock or options at the time they are granted, rather than waiting until the shares actually vest.

When you join an early-stage startup, your shares are usually subject to a vesting schedule (e.g., 4 years with a 1-year cliff). By default, the IRS taxes you on those shares as they vest. If the startup grows rapidly, the value of those shares might increase dramatically before they vest, resulting in a massive, unexpected tax bill.

By filing an 83(b) election, you preemptively tell the IRS, "Tax me on everything right now." Because the company is usually worth very little at the time of grant, the tax bill today is often zero or very small.

Why the 83(b) Election is Crucial for Founders

The primary goal of an 83(b) election is to convert what would have been high-rate ordinary income into lower-rate long-term capital gains.

Without an 83(b) election, every time a batch of shares vests, the difference between the current FMV and what you paid for the shares is taxed as ordinary income (which can be as high as 37%). If the company is doing well, this "phantom income" can force employees to sell shares just to cover the tax bill.

With an 83(b) election, you lock in your ordinary income tax at the grant date (when FMV and purchase price are usually identical, resulting in $0 tax). From that point forward, all future growth of the company is categorized as capital gains. When you eventually sell the stock (assuming you held it for over a year), you will pay the much lower capital gains tax rate (usually 15% to 20%).

The 30-Day Strict Deadline

This cannot be overstated: You must file your 83(b) election with the IRS within 30 days of the grant date.

There are virtually no exceptions. If you miss this deadline by even one day, the IRS will reject the election, and you will be forced to pay ordinary income tax on the shares as they vest. For successful startups, missing this deadline has literally cost founders and early employees millions of dollars.

It is highly recommended to mail the election form via USPS Certified Mail with a Return Receipt Requested, so you have absolute proof of the date it was sent and received.

The Risks of Filing an 83(b)

While an 83(b) election is almost always a no-brainer for early-stage founders receiving stock for pennies, it does carry risks for later-stage employees:

• Upfront Cash Required: If the FMV of the stock is high when you are granted the shares, filing an 83(b) means you must write a check to the IRS today for shares that you haven't even earned yet.
• The "Clawback" Risk: If you leave the company before your shares vest, you forfeit those unvested shares back to the company. However, the IRS will not refund the taxes you paid upfront via the 83(b) election. You took the gamble and lost.
• Company Failure: If the startup goes bankrupt and the shares become worthless, you cannot claim a tax deduction for the ordinary income taxes you paid upfront.

Understanding the Calculator Results

This calculator demonstrates the mathematical power of the 83(b) election by modeling a hypothetical exit scenario.

• Tax Owed NOW: This is the check you must write to the IRS if you file the 83(b). For early founders, this is often $0 because the purchase price equals the current FMV.
• Tax at Vesting: This is the "phantom income" trap you avoid by filing. If you don't file, and the company value spikes, you owe this amount out-of-pocket simply because the shares vested.
• Total Exit Tax: The taxes you will pay when the company is acquired or goes public. Notice how the blue bar (Capital Gains) is much larger in the 83(b) scenario, representing the conversion of your wealth into the more favorable tax bracket.

When Should You NOT File an 83(b)?

Generally, you might reconsider filing an 83(b) if:

• You are joining a late-stage, highly valued startup (like a Series C or D), and the upfront tax bill would be tens of thousands of dollars.
• You are not confident you will stay at the company long enough to vest the shares.
• You do not believe the company's valuation will increase.